State space and noise models of a signal

Hello
I would like to apply Kalman filter to the signal in the attached file. I am asking how to generate the required matrices for the space state and noise models, which I should input to the filter.
It is my first exposure to this subject,and I much appreciate simple explanations and a practical help.
Thank you
Attachments:
Signal 2.xlsx ‏10 KB

Yeah, unfortunately I don't think I'll be able to make it down to Austin for the conference.
But more importantly, I don’t think I completely solved my curve fitting problem. The curve fitting vi that I am using isn’t generating the output that I was expecting. My goal is to simply add noise to a signal, then reconstruct the signal finding the best fit line/curve, which best represents the original signal. Here is where I currently stand:
The frequency of the new graph is too high. A sinc function is produced, but it doesn’t share the same form as the original signal.
I've tried other options, such as the Levenberg-Marquardt method, but this is proving to be a bit difficult to understand. I will attach the curve_fitting.vi and the Levenberg-Marquardt example that I was looking at. I think the LM vi is very close to what I need, but I’m having trouble integrating my own numbers into the program, to generate the results that I need. If anyone has any advice with the curve fitting, or any information that might 'dumb-down' some of the sub vi's in the Levenberg-Marquardt program model, it would help me out.
Attachments:
SimpleFit.zip ‏147 KB
curve_fitting.vi ‏163 KB

Similar Messages

Implementation of state space model with constant disturbance in mathscript and simulation

I am new to LabVIEW and now I am doing a project realizing heater control in 8 rooms.
I have realized the state space model in the form x(k+1)=x(k)+u(k) using mathscript (using c_to_d) and feed it into control and simulation loop for simulation.
My problem is, in my project, I have to consider the disturbance from the other rooms. So the statespace model changed to be x(k+1)=x(k)+u(k)+E*d, where E is the matrix concerning the disturbance and d is the vector of disturbance. How could I implement the disturbance and discretize the new model in mathscript and which function to choose for the simulation. Discrete state space stochastic model?
Appreciate your kind help.

Hello, state space models in LabVIEW most of the time are being implemented by utilizing mathscript syntax
in addition with some functions of the LabVIEW Control Design and Simulation Module.
There´s a couple of nice tutorials for control design with these tools which I´d like to point you to as a first step.
http://www.ni.com/white-paper/6368/en/
http://www.ni.com/white-paper/6368/en/
http://www.ni.com/white-paper/6435/en/
http://home.hit.no/~hansha/documents/lab/Lab%20Work/MathScript/MathScript%20Lab%20-%20Part%20II.pdf
regards
Marco Brauner AES NIG

I have a state space model of a complex system. can anyone help me for implementing MPC and e-MPC control for the same?????

Hi everyone. I am new to the forums, so let me be as mprecise as possible. i know the basic functionalities of Labview with MPC block etc. However, i dont know how to go ahead with implementing MPC control for a system whose state space model i possess. can anyone help me out?? the problem is that i dont even know the approach or the starting point..

This happens if you remove a program manually, but still have the registry keys to load files from this program.<br />
You can use the MSConfig program or the Autoruns utility to see which software and services are getting started.
*http://technet.microsoft.com/en-us/sysinternals/bb963902.aspx
You can use registry editor and do a search (Ctrl+D) for imesh to see if you can locate the registry key(s) that launches this program on a reboot.
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* http://www.bleepingcomputer.com/forums/ - BleepingComputer.com - Computer Help Forums
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Plot a state-space model

Hi!
I'm currently doing a project and I'm stuck and am in need for some help.
I've done a state-space model that I'm using for this project. I've used Matlab (with and without simulink) to simulate this model and to plot its behaviour. But when I want to do this in LabVIEW, i get stuck.
I dont want to use Mathscript 'cause then it would be using Matlab.
Does anybody have some ideas of how I can simulate and plot my state-space model from the matrix parameters that i have?
Look at the attachment, I want to plot x.
Solved!
Go to Solution.
Attachments:
State-Space Model.png ‏11 KB

We have so many different ways to do this. Try to look at the following shipping examples:
C:\Program Files (x86)\National Instruments\LabVIEW 2011\examples\Control and Simulation\Control Design\Model Construction\CDEx Creating SS Model from String Matrix.vi
C:\Program Files (x86)\National Instruments\LabVIEW 2011\examples\Control and Simulation\Control Design\Model Construction\CDEx Rendering State-Space Equations.vi
C:\Program Files (x86)\National Instruments\LabVIEW 2011\examples\Control and Simulation\Control Design\Time Analysis\CDEx Time Domain Analysis.vi
C:\Program Files (x86)\National Instruments\LabVIEW 2011\examples\Control and Simulation\Simulation\Continuous Linear\SimEx state space.vi
They show how you can use the product to create a State-Space (SS) model, show the rendered model on the front panel, do a linear simulation of a model and implement the state-space model in the Control and Simulation Loop, respectively.
Notice also that we have an extensive amount of examples available for you. Hope this helps...
Barp - Control and Simulation Group - LabVIEW R&D - National Instruments

HELP!! This accessory is not optimized for this iPhone. You may experience noise interference and a decrease in cellular signal strength

Ive seen loads of people with this issue and no luck.
Basically as of yesterday, The message
This accessory is not optimized for this iPhone. You may experience noise interference and a decrease in cellular signal strength"
appeared and wont go away. I have nit used my headphones for a month so i cant think of anything that has triggered it.
Solutions I have tried..
Making sure my phone isnt on mute.
Letting the power dye and re charging.
plugging in head phones etc.
Still no luck.
Model is iPhone 3GS 16GB.

My mum's phone had that message too. I googled it. Sometimes the connection becomes dirty due to dust, dirt, water or a combination of all three. It is recommended to clean out the connection using a clean, dry brush, like a paint brush.
It worked for her
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I am trying to burn a dvd and it will not allow me to do this because it states that i do not have enough space for encoding disk. how do i free up space and from where?

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Control and design applying ramp input and plotting polar coordinates state space

Hi
I am trying to do a fairly simple state space task with Control Design and Simulation toolbox, however I am quite new at using this toolbox and need some help :-)
I want to simulate a MIMO system of a 2-DOF robot arm. The robot arm consists of two links, the first link can rotate arround its origo at its end, and the next link moves inside the first link, in and out.
So the two outputs is define as
r (radius), which is the distance to the end-effector of the robot, and
theta, which is the angular postion of the robot arm
FYI, the two inputs are the currents send to the two motors controlling each link.
I have set up A, B, C and D matrices in the attached VI file and putted it inside a simulation loop.
Now I need help :-)
I want to simulate the system when a ramp input is applied to the two inputs and plot the two outputs in a polar graph to show the end-effectors position when the system is just "let loose". The result should be a spiral (this is verified in MATLAB simulink).
So please, I need help setting up the VI to do the above, can anyone help?
Best regards
Simon
MSc. Eng.
Message Edited by SCMAJA on 10-16-2009 11:21 AM
LabVIEW 8.6 / 2009 / 2010
Vision Development Module 8.6 / 2009 / 2010
VBAI 3.6 / 2010
Attachments:
2 DOF robot with ramp input, polar coordinates plot, state space.vi ‏49 KB

Hello Simon,
The error comes from your Ramp Input. Since your system is MIMO, you would need to feed in a vector input to the system.
I've changed your VI and attached here~!
Andy Chang
National Instruments
LabVIEW Control Design and Simulation
Attachments:
MIMO Robot VI.vi ‏76 KB

Signal and Noise

Why am i showing negative values for signal and noise for my MBP under Airport Utility wireless clients? And what is a good value for rate? I'm showing around 104 for that.

Hello,
I have similar issue with my macbook, iphone and Time Capsule.
You can see it on this picture: http://img519.imageshack.us/img519/3853/timcacapsulehm6.png
macbook signal is -27
iphone signal is 66
I got those signals strenghts by putting the macbook and iphone next to the Time Capsule.
Why this difference ?? What's wrong ?? Anyone any idea ??

[svn:cairngorm3:] 17872: Popup: Exposed set accessor of open for view state usage and fixed bug when closing from model within popup .

Revision: 17872
Revision: 17872
Author:   [email protected]
Date:     2010-09-27 08:04:40 -0700 (Mon, 27 Sep 2010)
Log Message:
Popup: Exposed set accessor of open for view state usage and fixed bug when closing from model within popup. http://www.spicefactory.org/forum/viewtopic.php?p=3932. Added new sample to show model and view state interactions.
Modified Paths:
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Lots to be excited about. BUT...Just updated to 8.1 on one of my computers to test it out...
Sadly, the following issue is NOT fixed for me. Is it with new projects only? I haven't started a new project on 8.1 I've only opened an old project but the issue that I'm referring to which involves also a delay/freeze of anywhere from a few seconds to a MINUTE while the render bar goes from yellow to red and then back to yellow is still there. Boo.
On the list above...
Switching between sequences can turn the render bar red.
This issue is incredibly easy to replicate. I really do hope it gets fixed. Here are the steps:
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4) Hit SAVE.
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6) Toggle back to the original sequence and the delay occurs again.
7) Once you've toggled between sequences and have gone through this delay, that's it, there is no longer a delay...UNTIL...(and here's the big kicker)...until the project is SAVED again. After that the issue returns when you toggle between sequences. Both saving manually and AUTOSAVING cause this issue. No way around it except not editing with GPU acceleration.
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Sigh.

(Control Design & Simulation) State-Space block doesn't give output

I've tried and tried but can't get the State-Space block module to give me a graph / output.
I have no idea what the problem is and hope that somebody can help me. The numbers and calculations work in Matlab (Simulink) but i can't get it to simulate in labview.
Anybody got any ideas?
Solved!
Go to Solution.
Attachments:
Cavities.vi ‏30 KB
Matrixes.vi ‏27 KB

The problem is that you are assuming that LabVIEW executes left to right. Dataflow doesn't work this way. Your code as this:
does not tell LabVIEW that it has to execute everything from left to right. What is happening is that he is executing the 3 'island' of code in parallel and, in this case, it will have 'empty' values. You have to remove the local variables to make this work and dataflow paradigm will execute your code from left to right, as you want. here is the code:
Also, one more thing. Your input to the "CD Linear Simulation" is all zero. That means that you are trying to input zero input to a linear system, which will give you a zero output to the response. You probably do not want that since zero as input doesn't give you any more information. If you want to see how to system goes to zero after initial conditions, you should use "CD Initial Response". Or you should modify the input signal to the system. Please study this shipping example to understand how to use Linear Simulation and Initial Response:
C:\Program Files (x86)\National Instruments\LabVIEW 2012\examples\Control and Simulation\Control Design\Time Analysis\CDEx Time Domain Analysis.vi
Hope this helps...
Barp - Control and Simulation Group - LabVIEW R&D - National Instruments

Discrete state-space representation in FPGA

Hello all,
My aim is to simulate a discrete state-space model is the cRIO FPGA (in order to use an observer).
I am currently trying to simulate it on my computer without using the discrete state-space VI from the Control Design and Simulation toolbox (because there is not state-space model VI for the FPGA). However my discrete state-space model representation does not work.
There is below the continuous state-space model:
Then I obtained the discretized model (using the zero-order-hold and t=0.01s):
Below is the discretized state-space model I designed (in order to design a similar model in the FPGA):
Here is the discrete state-space VI I'm using to compare the results:
The graph plots the state X1, which is infinitely increasing. However it should look like a first order, as you can see:
I understand why the state X1 is increasing like this, I know I'm missing something (integration saturation ?).
Thanks in advance
Regards!
PS: Does somebody know if implenting other controller than the PID is doable in the cRIO FPGA? I also asking myself about matrix inversion if I want to use the Kalman gain in my observer.
PS2: I apologize for my disorganized/unclear Labview files, I'm beginning with it.
Solved!
Go to Solution.
Attachments:
SS Discret Simulation.vi ‏544 KB
SS Discret Model.vi ‏21 KB

Hi,
I think the problem might be caused by rounding errors in your A and B matrices. Have you tried getting it to display the values with greater precision?
Matlab calculates those values as: A = [0.995, 0.009925; 0 0.99], B = [2.488e-5; 0.004975]
Regards,
Ian

Any difference between 16 and 32GB model other than capacity?

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I've just had my 16GB iPhone 4 stolen, and it's not looking like I'm going to be able to get it back. So I'm going to have to dig deep and buy a new one. But I'd want an upgrade at the same time, to allow me to better cope with the loss. So I'm thinking about the 32GB model (also, i was pushed for space with the 16GB).
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No difference except for storage capacity.

PreparedStatement space and empty String

Hi, I have this problem:
PreparedStatement bookedQtyPS = null;
String qry="SELECT * from djwsearch where djwitem=?;
bookedQtyPS = conn.prepareStatement(qry);
if(item.equals(""){ //item is an empty String
bookedQtyPS.setString(1," "); // I set space instead of empty String
}else{
bookedQtyPS.setString(1,item);
My problem is that I need to set space insteadOf empty String, but I think that I can not use PreparedStatement to do this. I have performance problems (my query is much more complicated than this one) so I choose PreparedStatement and not Statement.
How can I do? Is this bug solved using PreparedStatement?
Thanks.

you can do it with the help of PreparedStatement.
Here the type of field(djwitem) and setmethod is should be match..i mean if the type of ur field is String then you need to use the setSting method.
you can do one thing specify one string variable.
String space=" ";
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I have a 13" mac book pro with a 250 gb solid state drive and I would like to put in a larger one is this possible

I own a Mac book Pro 13" it has a 250 gb solid state drive and I would like to put a larger one in is this possible.

You don't need to partition your drive to run Fusion, only if you want to run Bootcamp.
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How convert spaces in logical model to underscores in physical model

Hi,
in Oracle Designer we used spaces in logical model objects (entities, attributes, relations) which were automatically converted to underscores when the physical model was generated from the logical one. Is there any way how do this conversion in Data Modeler? So far I have been able to convert mixed case in logical model to uppercase in physical model (with the exception of foreign keys) but changing space to underscores still eludes me.
Why I think this is important: the logical model should use "normal" language if possible, i.e. spaces, mixed case etc. But the physical model should have uppercase only and definitely no spaces. Having objects in Oracle defined with spaces leads to many difficulties since any reference to the object must use "" around the name of the object...
Thanks
Jakub

Hi,
but the problems continues (even when the model is reduced to no entities at all!)
The error you reported (in engineering and import) cannot be reached if there are no entities and attributes - it's a specific error probably related to usage of distinct types that are removed from design.
You can use search functionality in order to find attributes/columns (logical/relational model) with incorrect data type definition based on distinct type.
And it's better to move to Data Modeler 4.0 (833).
So what to search (example is on logical model - it's the same for relational model - column):
1) Activate search window (CTRL-F when logical diagram is active, or Find icon), switch to advanced mode
2) for "Object type" Attribute:
- check "Data Type kind" line and put DT as search text
- check "Distinct type" line, don't put search text - it'll search for attributes without distinct type
- change the operand for expression from OR to AND
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If you find some attributes, then you need to decide what to do with them - to set data type or to delete them.
The same for columns in relational model.
Philip

State space and noise models of a signal

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